The NFPA 13 committee believes the tank size is indeed based on the CALCULATED volume of water. I know this because I attempted several cycles ago to state we should simply use the curves with a modifier. I was almost burned at the stake for uttering such blasphemy.
Roland Roland Huggins, PE - Senior VP Engineering American Fire Sprinkler Assn. Dallas, TX http://www.firesprinkler.org <http://www.firesprinkler.org/> Fire Sprinklers Saves Lives > On Mar 20, 2019, at 7:48 AM, AKS-Gmail-IMAP <[email protected]> wrote: > > Tank sizing for some situations presents an uncomfortable dilemma because > there are pressures from all sides to minimize the tank size yet we all know > the tank contains the single most important item. Some codes can be argued to > say the size is for sprinkler demand only. The code might also qualify that > by implying the actual system calculated sprinkler demand is used for sizing. > So in this case the OH-2 system might have a 1.8 overage at its most > demanding location. But then what happens if the fire event occurs at the > least pressure demanding part of the system where the overage is higher than > 1.8? Here we can only hope that more water in less time is better and perhaps > not so many sprinklers open and someone is present to manage the run time. > The same pressures to limit the tank size might also work against installing > a more water efficient sprinkler system for that OH-2 space. >
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